JPH08211475A - Device and camera provide with line-of-sight detection function - Google Patents

Abstract

PURPOSE: To clearly distinguish index display for a case that the function of a camera can not be operated from the index display for a case that the function of the camera can be operated by the input of the line of sight, and to prevent a user from having an illusion as if the function of the camera can be operated by the input of the line of sight when the function of the camera can not be operated by the input of the line of sight. CONSTITUTION: This camera is provided with discriminating means 10 and 16 discriminating propriety of functioning a focal distance variable means 15 in the case close observation toward the index inside a finder is detected by the line-of-sight detecting means 13 and 16, and a display varying means 16 changing the display of the index by means of the index display means 14 to a second condition (changing of the display color of index, etc.) which is different from a first condition expressing that the focal distance varying means 15 is made to function by the input of the line of sight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device with a line-of-sight detection function, which is capable of automatically activating a function corresponding to an index displayed on an observation screen,
It also relates to an improvement of the camera with the line-of-sight detection function.

[0002]

2. Description of the Related Art Conventionally, as a camera of this kind, as described in Japanese Patent Application No. 5-295391, the photographer's line-of-sight detecting means indicates that the photographer is gazing at the index displayed in the viewfinder. It is configured to perform zooming and panorama switching according to the index.

Further, as described in US Pat. No. 5,245,381, the display in the viewfinder is made inconspicuous during detection of the line of sight of the photographer to prevent the line of sight from becoming undefined. There is.

[0004]

However, in the above-mentioned conventional example, for example, when the focal length is changed by inputting the line of sight, the attached lens is a single focus lens, or the focal length is changed by the photographer. If you select a shooting mode that cannot be freely performed, such as a constant magnification mode in which the camera measures the distance to the subject and automatically changes the focal length, it is possible for the photographer to change the focal length according to the line of sight. There was a problem of giving an illusion as if there were.

Further, in a camera provided with an automatic zooming mode for automatically performing zooming and a manual mode for manually performing zooming, an index for zooming is displayed even though the photographer selects the manual mode. However, there is a problem in that it gives the illusion that the focal length can be changed by the line of sight.

(Object of the Invention) An object of the present invention is to clearly distinguish the index display when the function of the device or the camera cannot be operated by the line-of-sight input and when it is possible,
It is an object of the present invention to provide a device with a line-of-sight detection function and a camera with a line-of-sight detection function that does not give an illusion as if the function could not be moved by the line-of-sight input.

[0007]

In order to achieve the above object, the present invention according to claim 1 is characterized in that when the gaze of an index on the observation screen is detected by the line-of-sight detecting means, A discriminating means for discriminating whether or not the function corresponding to the index can be operated, and when the discriminating means judges that the function corresponding to the index is inoperable, display of the index by the index display means Is provided with a display variable means for changing the first state to a second state different from the first state indicating the operable state,
If the function corresponding to the index cannot be activated even if the index is input through the line of sight, the display of the index on the index display means is changed to the second state different from the first state indicating the operable state. For example, the indicator is changed from a lighted state to a light-off state, the index itself is changed, or the display color of the index is changed.

In order to achieve the above object, the present invention according to claim 2 makes the focal length varying means function when the gaze of the index in the finder is detected by the sight line detecting means. A discriminating means for discriminating the propriety, and if it is discriminated that the discriminating means cannot function, the indication of the indicator by the indicator displaying means indicates that the focal length varying means functions by the line-of-sight input. The display variable means for changing the state to the second state different from the above state is provided, and when the focal length variable means cannot be operated, such as when a single focus lens is attached, the index display means displays the index. Is changed to a second state different from the first state indicating that the focal length varying means functions by the line-of-sight input, that is, for example, the indicator is turned on from the turned-off state,
The index itself is made different, or the display color of the index is made different.

In order to achieve the above object, the present invention according to claim 4 is one of an automatic mode for varying the focal length by using the focal length varying means and a manual mode for manually varying the focal length. When the manual mode for manually changing the focal length is selected by the selecting means for selecting,
Display changing means for changing the display of the index by the index displaying means to a second state different from the first state showing the automatic mode in which the focal length changing means is made to function by the line-of-sight input to change the focal length. If the mode for manually changing the focal length is selected, the display of the index on the index display means is changed to the automatic mode in which the focal length changing means is caused to function by the line-of-sight input to change the focal length. To a second state different from the first state, that is, for example, to change the indicator from a lit state to an unlit state, to change the indicator itself, or to change the display color of the indicator. I have to.

In order to achieve the above object, according to the present invention of claim 5, when the photographing mode in which the focal length cannot be freely changed is selected by the photographer, the index displayed by the index display means is used. The display variable means for changing the display to the second state different from the first state in which the focal length varying means can be operated by the line-of-sight input to change the focal length is provided so that the photographing magnification becomes constant. When a portrait mode to be controlled or a shooting mode such as close-up in which the focal length is fixed at a fixed position is selected, the index display on the index display unit is changed to the focal length variable unit by the line-of-sight input. Change to a second state that is different from the first state in which the function can be performed and the focal length can be varied, that is, for example, the state where the indicator is turned on is turned off, or the indicator itself is different Or, so that or to different display color of the indicator.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIGS. 1A and 1B are views showing a display form in a viewfinder of a camera according to a first embodiment of the present invention.

Reference numeral 1 indicates a first state in which an index described later is displayed in the finder, and 2 indicates a second state in which the index is not displayed. Reference numeral 3 is an index for moving the taking lens and finder to the wide side, and 4 is an index for moving to the tele side. Whether or not the photographer is gazing at this index by the line-of-sight detecting means described later. To be determined. A mark 5 indicates the center of the finder, and a distance measuring point is usually provided in the vicinity of this mark. Reference numeral 6 is a field frame that represents a shooting range.

FIG. 2 is a block diagram showing a schematic configuration of the above camera.

In the figure, reference numeral 10 is a lens for determining whether the mounted lens is a variable focus lens, a fixed focus lens, or a lens capable of changing the focal length according to the line of sight of the photographer (so-called auto zoom). It is a determination means. Reference numeral 11 is a zoom mode selecting means for selecting and switching between a manual mode in which the photographer manually performs a zooming operation and an automatic mode in which the operator automatically observes an index, and 12 is a zoom mode selecting means 11 for the photographer. Is a mode discriminating means for discriminating which mode is selected. Reference numeral 13 is a line-of-sight detecting means for detecting the position of the line of sight (gazing point) in the viewfinder of the photographer and discriminating which index is being gazed.

Reference numeral 14 displays an index for urging the photographer to gaze in the viewfinder and, if necessary, changes from the first state to the second state.
This is an index display means for changing the display in the finder to the state of (3) and notifying the photographer whether or not the camera can be controlled by the line of sight. Reference numeral 15 is a focal length changing means for changing the focal lengths of the photographing lens and the finder through a driving means (not shown) in accordance with a command signal from a microcomputer 16 described later.
Reference numeral 16 denotes a control microcomputer, which switches the display / non-display state of the index by the index display means 14 based on the output signals from the lens determination means 10 and the zoom mode determination means 12, or the signal from the line-of-sight detection means 13. Accordingly, the focal length changing means 15 changes the focal length.

FIG. 3 is a diagram showing a schematic structure of the line-of-sight detecting means 13.

In the figure, reference numeral 20 is a camera body, and 21 is a lens having a photographic optical system detachably attached to the camera body 21. Reference numeral 11 denotes the zoom mode selection means shown in FIG. Reference numeral 22 is a liquid crystal plate for displaying a viewfinder field frame or an index, 23 is a dichroic mirror that is a half mirror that transmits visible light and reflects infrared light, 24 is an eyepiece lens, 25 is a condenser lens, 26 Is CC for line-of-sight detection
D and 27 are infrared light emitting diodes for illuminating the photographer's eye 28.

From the liquid crystal plate 22 to the infrared light emitting diode 2
The line-of-sight detection means is constituted by 7 and the means functions as follows.

That is, the infrared light emitting diode 27 illuminates the eye 28 of the photographer looking into the viewfinder, and the reflected light here is taken into the CCD 26 through the condenser lens 25,
As is well known, from the corneal reflection image and the imaging position of the pupil, the eyeball 28
The rotation angle is calculated to determine where the photographer is looking in the viewfinder.

Although FIG. 3 shows a camera in which the lens can be exchanged, even a camera in which the lens cannot be exchanged can be used as long as the camera can change the focal length by manual / auto switching.
The present invention is effective.

Next, the operation of the main part of the camera having the above structure will be described with reference to the flow chart of FIG. 4 [Step # 1] By turning on a power switch (not shown), power is supplied to each means. . [Step # 2] The lens determination means 10 determines whether or not the currently mounted lens is a variable focus lens (a lens that can be zoomed from the camera body side by the focal length changing means 15), and if it is a variable focus lens, step # 2. 3. If not, proceed to step # 12.

Here, it is assumed that the currently mounted lens is a variable focus lens and the process proceeds to step # 3. [Step # 3] The zoom mode discrimination means 12 discriminates which of the automatic mode in which the focal length is changed by the line of sight and the manual mode in which the focal length is manually selected is selected, and if the automatic mode is selected, the step # 4.
Go to step # 12 if the manual mode is selected.

Here, it is assumed that the automatic zoom is selected, and the process proceeds to step # 4. [Step # 4] The index display means 14 displays the indexes 3 and 4 that prompt the photographer to gaze in the viewfinder. That is, the display in the finder is brought into the first state shown in FIG. [Step # 5] Here, by the line-of-sight detection means 13,
As described above, the line-of-sight position (gazing point) in the viewfinder of the photographer is detected. [Step # 6] It is determined whether the photographer is gazing at the same index for a certain period of time based on the line-of-sight detection result of the above step # 5. If the same index is gazed at, the step # 7 is performed.
Go to. If not, the process returns to step # 5 and the same operation is repeated. [Step # 7] Here, it is determined which of the telescopic side index 4 and the wide side index 3 is gazing, and based on this, the taking lens and the finder are operated via the focal length changing means 15 and a driving means (not shown). Change the focal length of. [Step # 8] Similar to the above step # 5, the line-of-sight detecting means 13 detects the line-of-sight position (gazing point) in the viewfinder of the photographer. [Step # 9] Here, there is the intention to continue changing the focal length, and it is determined whether or not the photographer is gazing at the above index. As a result, if the operator continues to pay attention to the index, the procedure returns to step # 7, and if not, step # 10.
Go to.

Therefore, the operation of changing the focal lengths of the photographing lens and the finder is continued while the index 4 is being watched. [Step # 10] After the photographing angle of view is determined, a release button (not shown) is pressed by the photographer to determine whether or not the exposure on the film is completed. If the exposure is completed, the process proceeds to step # 11, and if not, the process returns to step # 2. [Step # 11] In order to determine whether or not the photographer should continue shooting, it is checked whether or not the power switch is off. If not, the process returns to step # 2.
If it is OFF, this operation ends.

If it is determined in step # 2 that the currently mounted lens is not a variable focus lens,
Alternatively, when it is determined in step # 3 that the manual mode for manually zooming is selected, the process proceeds to step # 12 in any case as described above. [Step # 12] The index display means 14 brings about a second state (see FIG. 1B) in which neither of the indexes 3 and 4 is displayed in the finder.

According to the first embodiment, for example, in a camera capable of changing the focal length by the line of sight, when a lens whose focal length cannot be changed is attached to the camera, or when the focal length is manually changed, When the mode for changing is selected, that is, when the camera sequence cannot be advanced due to the line-of-sight input, the state in the viewfinder is switched from the first state to the second state in which no index is displayed. Therefore, the photographer can be informed that the sequence cannot be advanced by the line-of-sight input, and the illusion that the sequence will be advanced by the line-of-sight input can be eliminated.

(Second Embodiment) FIG. 5 is a rear view showing a camera according to a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals.

In the figure, 31 is a photographing mode selecting means, which is rotatably arranged on the back cover of the camera body 20,
By aligning the mark associated with each shooting mode with the arrow 38, shooting in a desired shooting mode is executed. Reference numeral 32 is a mark for stopping the power supply (switch OFF), and 33 is an auto mode mark for performing all the photographing operations automatically. Reference numeral 34 is an action mode mark that allows continuous shooting by continuously focusing on the movement of the subject. Further, 35 is a mark for a night view mode for performing slow synchronization, 36 is a mark for a portrait mode (a mode in which the camera automatically zooms so that the upper half of a person's body enters, and 37 is a mark), and 37 is for a flower or the like. It is a mark for close-up mode (a mode that is fixed when the focal length is constant) for shooting.

The above close-up mode (mark 3
In 7) and portrait mode (mark 36),
The focal length cannot be changed by the line of sight.

In the circuit configuration of the camera, the lens discriminating means 10, the zoom mode discriminating means 12 and the mode selecting means 11 shown in FIG. 2 are replaced with the photographing mode selecting means 31.
The other means are the same.

Next, the operation of the main part of the camera having the above structure will be described with reference to the flowchart of FIG. [Step # 21] By turning on a power switch (not shown), power is supplied to each means. [Step # 22] The photographing mode selection means 31 determines which photographing mode the photographer has selected, and when the close-up mode or the portrait mode in which zooming cannot be performed by the line-of-sight input is selected, step # 3.
If the shooting mode is other than 1, the process goes to step # 23.

Here, it is assumed that the photographing mode capable of zooming is selected by the line-of-sight input, and the process proceeds to step # 23. [Step # 23] The index display means 14 displays the indexes 3 and 4 that prompt the photographer's gaze in the finder (in the first state). [Step # 24] Here, the line-of-sight detection unit 13 causes the line-of-sight position (gazing point) of the photographer in the finder.
To detect. [Step # 25] It is determined whether or not the photographer is gazing at the same index for a certain period of time, and if they are gazing at the same index, the process proceeds to step # 26. Also, otherwise step #
Returning to 24, the same operation is repeated. [Step # 26] Here, it is determined which of the telescopic side index 4 and the wide side index 3 is gazing, and based on this, the taking lens and the viewfinder are operated via the focal length changing means 15 and a driving means (not shown). Change the focal length of. [Step # 27] The line-of-sight detection means 13 detects the line-of-sight position (gazing point) of the photographer in the viewfinder. [Step # 28] Here, there is the intention to continue changing the focal length, and it is determined whether or not the photographer is gazing at the same index. As a result, if the same index is being continuously watched, the process returns to step # 26, and if not, the process proceeds to step # 29.

Therefore, the operation of changing the focal lengths of the photographing lens and the finder is continued while the index 4 is being watched. [Step # 29] After the photographing angle of view is determined, a release button (not shown) is pressed by the photographer to determine whether or not the exposure to the film is completed. If the exposure is completed, the process proceeds to step # 30, and if not, step # 22.
Return to. [Step # 30] In order to determine whether or not the photographer should continue shooting, it is checked whether or not the power switch is off. If not, the process returns to step # 22. If it is OFF, this operation ends.

If it is determined in step # 22 that the close-up mode or portrait mode in which zooming cannot be performed is selected by the line-of-sight input,
As described above, the process proceeds to step # 31. [Step # 31] The index display means 14 brings about a second state (see FIG. 1B) in which neither the index 3 nor the index 4 is displayed in the finder.

According to the second embodiment described above, in the camera that enables the change of the focal length, for example, by the line-of-sight input,
When the currently selected shooting mode is the close-up mode or the portrait mode in which zooming cannot be performed by the line of sight, that is, when the camera sequence cannot be advanced by the line of sight input, the state in the viewfinder is changed from the first state. Since it is switched to the second state in which the index of is also not displayed, it is possible to inform the photographer that the sequence cannot be advanced by the line-of-sight input, and the illusion that the sequence will be advanced by the line-of-sight input To give away.

Regardless of the above-mentioned photographing mode, it is not necessary to advance the sequence of the camera by the line-of-sight input, for example, when the self-timer is set or the remote controller is used, the index is similarly changed from the first state to the second state. Change to.

(Third Embodiment) FIG. 7 is a diagram showing a display mode example in a viewfinder of a camera according to a third embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals. is there.

In this embodiment, as shown in FIG.
An index 7 that is completely different from the indexes 3 and 4 displayed in the first state is displayed, and this is set as the second state to notify the photographer that zooming cannot be performed by inputting the line of sight. Therefore, it is not necessary to give the photographer the illusion that the sequence proceeds due to the line-of-sight input.

The other operations are similar to those of the first or second embodiment, and the description thereof will be omitted.

(Fourth Embodiment) FIG. 8 is a diagram showing an example of a display mode in a viewfinder of a camera according to a fourth embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals. is there.

In this embodiment, as shown in FIG.
Compared to the indexes 3 and 4 in the first state, small indexes 8 and 9 are displayed, and these are set in the second state to notify the photographer that zooming cannot be performed by the line-of-sight input. Therefore, as in each of the above-described embodiments, the photographer is not given the illusion that the sequence proceeds due to the line-of-sight input.

The other operations are the same as those in the first or second embodiment, so the description thereof will be omitted.

(Correspondence between Invention and Embodiment) In this embodiment, the line-of-sight detection means 13 and the microcomputer 16 correspond to the line-of-sight detection means of the present invention, the index display means 14 corresponds to the index display means of the present invention, and the lens The discriminating means 10, the zoom mode discriminating means 12, and the microcomputer 16 correspond to the discriminating means of the present invention,
The microcomputer 16 corresponds to the display changing means of the present invention.

The above is the correspondence relationship between each configuration of the embodiments and each configuration of the present invention, but the present invention is not limited to the configurations of these embodiments, and the functions or embodiments shown in the claims or the embodiments It goes without saying that any structure may be used as long as it can achieve the function of.

(Modification) In the present embodiment, the second method for informing the photographer that zooming cannot be performed by the line-of-sight input.
As a display of, for example, in the first embodiment, the indexes 3 and 4 are made invisible, and in the second and third embodiments, different indexes 7 to 9 are displayed.
Is displayed, the display colors of the indexes 3 and 4 may be different, or the display colors of the indexes 7 to 9 may be different.

Furthermore, if the first state is a state where the index is turned on, the second state may be a blinking state or the brightness may be different.

The present invention can be applied to any camera such as a single-lens reflex camera, a lens shutter camera, a video camera and the like. Further, the present invention can be applied to other optical devices and other devices having a visual axis detection function, and also as a constituent unit.

Furthermore, the present invention may be constructed by appropriately combining the above embodiments or their techniques.

[0050]

As described above, according to the present invention,
If the function corresponding to the index cannot be activated even if the index is input through the line of sight, the display of the index on the index display means is changed to the second state different from the first state indicating the operable state. For example, the indicator is changed from a lighted state to a light-off state, the index itself is changed, or the display color of the index is changed.

Further, according to the present invention, when it is impossible to operate the focal length varying means such as when a single focus lens is attached, the indicator display means can display the index and the focal length can be changed by the line-of-sight input. A second state different from the first state indicating that the means functions is changed, that is, for example, the indicator is turned on from the unlit state, the indicator itself is changed, or the display color of the indicator is changed. I try to make them different.

Further, according to the present invention, when the mode for manually changing the focal length is selected, the display of the index on the index display means is performed by operating the focal length changing means by inputting the line of sight. Change to a second state different from the first state indicating the automatic mode in which the variable can be performed, that is, for example, changing the indicator from a lit state to a non-lit state, or changing the indicator itself, Different colors are used for display.

Further, according to the present invention, when the portrait mode in which the photographing magnification is controlled to be constant or the photographing mode such as close-up in which the focal length is fixed at a fixed position is selected, A second state different from the first state in which the display of the index on the index display unit can change the focal length by operating the focal length changing unit by the line-of-sight input.
The state is changed to, for example, the indicator is turned off from the lit state, the indicator itself is made different, or the display color of the indicator is made different.

Therefore, the index display is clearly distinguished between the case where the function of the device or the camera cannot be operated by the line-of-sight input and the case where the function can be operated by the line-of-sight input. It is possible to prevent giving an illusion that is possible by inputting.

[Brief description of drawings]

FIG. 1 is a diagram showing a display form in a viewfinder of a camera according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of the camera of FIG.

FIG. 3 is a diagram showing a schematic configuration of a line-of-sight detection means of FIG.

FIG. 4 is a flowchart showing an operation of a main part of the camera of the first embodiment of the present invention.

FIG. 5 is a rear view showing a camera according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of a main part of the camera of the second embodiment of the present invention.

FIG. 7 is a diagram showing a display form example in a viewfinder of a camera according to a third embodiment of the present invention.

FIG. 8 is a diagram showing a display mode example in a viewfinder of a camera of a fourth embodiment of the present invention.

[Explanation of symbols]

 3, 4, 7, 8, 9 Index 10 Lens determination means 12 Zoom mode determination means 13 Line-of-sight detection means 14 Index display means 15 Focal length change means 16 Microcomputer 22 Liquid crystal plate 23 Dichroic mirror 24 Eyepiece lens 25 Condenser lens 26 CCD 27 Infrared light emitting diode 31 photographing mode selection means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Toyota 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (16)

[Claims] 1. A line-of-sight provided with an index display unit for displaying an index for operating a function of the apparatus on the observation screen by a line-of-sight input, and a line-of-sight detection unit for detecting the line of sight of an observer on the observation screen. In the device with a detection function, when the gaze of the index is detected by the line-of-sight detection unit, a determination unit that determines whether or not the function corresponding to the index can be activated by the line-of-sight input, and the determination unit. When it is determined by the means that the function corresponding to the index is inoperable, the display variable for changing the display of the index by the index display means to the second state different from the first state indicating the operable state. An apparatus with a line-of-sight detection function, which is provided with: 2. An index display means for displaying an index selected by a line of sight in a finder when changing a focal length of the optical system, a line of sight detecting means for detecting a line of sight of a photographer in the finder, and an optical system In a camera with a visual axis detection function equipped with a focal length varying means for changing the focal length, when the gaze of the index is detected by the visual axis detecting means, it is possible to operate the focal length varying means. When it is determined that it is impossible for the indicator to function, the indicator display by the indicator display unit indicates that the focal length varying unit functions by the line-of-sight input. A camera with a line-of-sight detection function, which is provided with display varying means for changing the state from the first state to a second state. 3. The camera with a line-of-sight detection function according to claim 2, wherein the determination unit is a unit that determines whether or not a variable focal length lens is attached. 4. An index display means for displaying an index selected from the line of sight in the viewfinder when changing the focal length of the optical system, a line-of-sight detection means for detecting the line of sight of the photographer in the viewfinder, and the optical system Line-of-sight detection provided with focal length varying means for changing the focal length, and selecting means for selecting either an automatic mode for varying the focal length using the focal length varying means or a manual mode for manually varying the focal length. In the camera with a function, when the manual mode for manually changing the focal length by the selecting means is selected, the display of the index by the index displaying means causes the focal length changing means to function and the focal length by inputting the line of sight. A second state different from the first state showing the automatic mode in which the variable can be performed.
A camera with a line-of-sight detection function, which is provided with a display varying means for changing the state of the display. 5. An index display means for displaying an index selected by a line-of-sight input when changing a focal length of the optical system in a finder, a line-of-sight detecting means for detecting a line of sight of a photographer in the finder, and an optical system. In a camera with a line-of-sight detection function, which has at least a photographing mode in which the photographer cannot freely change the focal length, the focal length can be freely changed by the photographer. When the shooting mode is selected,
Display changing means is provided for changing the display of the index by the index displaying means to a second state different from the first state in which the focal length changing means can be operated by the eye-gaze input to change the focal length. A camera with a line-of-sight detection function. 6. The change of the focal length of the optical system is to change the focal length of at least the lens of the lens and the finder optical system.
The camera with the line-of-sight detection function according to 3, 4, or 5. 7. The apparatus with a line-of-sight detection function according to claim 1, wherein the second state is a state in which the display of the index is invisible. 8. The device with gaze detection function according to claim 1, wherein the second state is to display an index different from the index in the first state. 9. The device with a line-of-sight detection function according to claim 1, wherein the second state is to display an index with a display color different from that in the first state. 10. The device with gaze detection function according to claim 1, wherein the second state is to display an index having a size different from that in the first state. 11. The device with a line-of-sight detection function according to claim 1, wherein the second state is to display an index having a brightness different from that in the first state. 12. The camera with a line-of-sight detection function according to claim 2, 3, 4, 5 or 6, wherein the second state is a state where the display of the index is invisible. 13. The gaze detection according to claim 2, 3, 4, 5 or 6, wherein the second state is to display an index different from the index in the first state. A camera with functions. 14. The display device according to claim 2, wherein the second state is to display an index with a display color different from that in the first state. Camera with line-of-sight detection function. 15. The method according to claim 2, wherein the second state is to display an index having a size different from that in the first state. Camera with line-of-sight detection function. 16. The line-of-sight detection according to claim 2, 3, 4, 5 or 6, wherein the second state is to display an index of brightness different from that in the first state. A camera with functions.